Park By Text made customers aware of the potential breach this evening

It came after the service experienced an outage today. It resumed after the issue was resolved but they "then noticed a potentially malicious software on our server".

In the message - which was tweeted by broadcaster Jonathan Healy - customers were informed that if the breach did occur details such as address and driver's license as well as car registrations and mobile numbers could have been released through the hack.

They, however, stress that no credit or debit card details could have been stolen because they are encrypted.

It read: "As you may be aware, we experienced a service outage today which has now been resolved.

"The outage was a knock-on effect of the previous outage, caused through a technical communications issue within the data center. A resolution at the time was to move to a different network and run the system as normal. We then noticed a potentially malicious software on our server and immediately addressed this.

"We are currently investigating whether a breach of our customer's data occurred through the software.